TA的每日心情 | 开心 2022-1-29 15:04 |
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签到天数: 1 天 [LV.1]初来乍到
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是平面的等角对数螺旋么?cst丛书9里有例子,给你个函数算了,a是螺旋增长率,r是起始半径3 r' l- J* E; }' @+ [/ Z
Dim xxx As Double, yyy As Double,ttt As Double,a As Double,r As Double
# Q7 [) t$ F0 Ba=0.221
4 N0 q( @# X9 \6 H8 T2 S7 jr=2+ S0 h4 r. g$ o( V8 D7 ^
For ttt = 0 To 4*pi STEP pi/32) _; m: @: I+ }+ a; n8 ?
xxx=r*exp(a*ttt)*cos(ttt)2 I" [! q0 `: V
yyy = r*exp(a*ttt)*sin(ttt)
5 \9 Z1 w' s- d; m O2 g* q! h % _' S+ S! y7 t& z& C" j
.LineTo xxx , yyy' {8 Q! I, |1 @3 n, }+ j' L
Next ttt |
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